How to calculate how much paint your room needs


If you are enthusiastic about home DIY and want to paint the interior of your house, you will need to calculate exactly how much paint will be needed in order to get the job done with as little waste as possible. Let’s face it – paint can be expensive, so you will want to save as much as you can without sacrificing on quality. Ultimately, when it comes to interior house painting, the goal is to ensure that it lasts for many years to come, and cheap paint definitely won’t cut it in this regard. Here’s how to reduce costs by accurately calculating how much paint each room needs:

  • How big is the room?

This should be the first thing that you work by measuring the length (you only have to do this once) and width of each wall. The general rule is that one gallon can of paint will cover up to 400 square feet, which is ideal for a smaller room such as a bathroom or a small study. Two cans of paint cover up to 800 square feet, which is perfect for slightly bigger rooms, such as the kitchen or living room.


  • How many windows and doors?

If two rooms are of the same size, but one has more windows or more doors than the other, it will require less paint overall. Measure the width and height of each window and door and subtract it from the conclusion of your calculations that you came to when measuring the walls themselves.


  • How high are the ceilings?

If you live in a home with very high ceilings, you will require more paint than you would for a room of the same size with lower ceilings. To give you some perspective, the average ceiling height in the USA is between 8 – 9 feet. Keep this in mind before visiting the paint store.


If you would prefer to let the experts handle the interior house painting job, Ray the Painter is the painting contractor to contact. Whether you need exterior house painting or interior house painters, we have many positive reviews from satisfied customers. Take a look at our testimonials to find out more.

If you’re in need of expert painting services, contact Ray the Painter or fill out a bid request today.